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thumoc
2 năm trước
Tứ giác ABCD có hai đường chéo AC và BD vương góc với nhau. Gọi E,F,G,H lần lượt là trung điểm của AB,BC,CD,DA. Tính diện tích tứ giác EFGH , biết AC= 8 cm ; BD= 6cm
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